net/rxrpc/ar-internal.h

   1 /* AF_RXRPC internal definitions
   2  *
   3  * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
   4  * Written by David Howells (dhowells@redhat.com)
   5  *
   6  * This program is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU General Public License
   8  * as published by the Free Software Foundation; either version
   9  * 2 of the License, or (at your option) any later version.
  10  */
  11
  12 #include <linux/atomic.h>
  13 #include <linux/seqlock.h>
  14 #include <net/net_namespace.h>
  15 #include <net/netns/generic.h>
  16 #include <net/sock.h>
  17 #include <net/af_rxrpc.h>
  18 #include "protocol.h"
  19
  20 #if 0
  21 #define CHECK_SLAB_OKAY(X)                                   \
  22         BUG_ON(atomic_read((X)) >> (sizeof(atomic_t) - 2) == \
  23                (POISON_FREE << 8 | POISON_FREE))
  24 #else
  25 #define CHECK_SLAB_OKAY(X) do {} while (0)
  26 #endif
  27
  28 #define FCRYPT_BSIZE 8
  29 struct rxrpc_crypt {
  30         union {
  31                 u8      x[FCRYPT_BSIZE];
  32                 __be32  n[2];
  33         };
  34 } __attribute__((aligned(8)));
  35
  36 #define rxrpc_queue_work(WS)    queue_work(rxrpc_workqueue, (WS))
  37 #define rxrpc_queue_delayed_work(WS,D)  \
  38         queue_delayed_work(rxrpc_workqueue, (WS), (D))
  39
  40 struct rxrpc_connection;
  41
  42 /*
  43  * Mark applied to socket buffers.
  44  */
  45 enum rxrpc_skb_mark {
  46         RXRPC_SKB_MARK_DATA,            /* data message */
  47         RXRPC_SKB_MARK_FINAL_ACK,       /* final ACK received message */
  48         RXRPC_SKB_MARK_BUSY,            /* server busy message */
  49         RXRPC_SKB_MARK_REMOTE_ABORT,    /* remote abort message */
  50         RXRPC_SKB_MARK_LOCAL_ABORT,     /* local abort message */
  51         RXRPC_SKB_MARK_NET_ERROR,       /* network error message */
  52         RXRPC_SKB_MARK_LOCAL_ERROR,     /* local error message */
  53         RXRPC_SKB_MARK_NEW_CALL,        /* local error message */
  54 };
  55
  56 /*
  57  * sk_state for RxRPC sockets
  58  */
  59 enum {
  60         RXRPC_UNBOUND = 0,
  61         RXRPC_CLIENT_UNBOUND,           /* Unbound socket used as client */
  62         RXRPC_CLIENT_BOUND,             /* client local address bound */
  63         RXRPC_SERVER_BOUND,             /* server local address bound */
  64         RXRPC_SERVER_BOUND2,            /* second server local address bound */
  65         RXRPC_SERVER_LISTENING,         /* server listening for connections */
  66         RXRPC_SERVER_LISTEN_DISABLED,   /* server listening disabled */
  67         RXRPC_CLOSE,                    /* socket is being closed */
  68 };
  69
  70 /*
  71  * Per-network namespace data.
  72  */
  73 struct rxrpc_net {
  74         struct proc_dir_entry   *proc_net;      /* Subdir in /proc/net */
  75         u32                     epoch;          /* Local epoch for detecting local-end reset */
  76         struct list_head        calls;          /* List of calls active in this namespace */
  77         rwlock_t                call_lock;      /* Lock for ->calls */
  78         atomic_t                nr_calls;       /* Count of allocated calls */
  79
  80         atomic_t                nr_conns;
  81         struct list_head        conn_proc_list; /* List of conns in this namespace for proc */
  82         struct list_head        service_conns;  /* Service conns in this namespace */
  83         rwlock_t                conn_lock;      /* Lock for ->conn_proc_list, ->service_conns */
  84         struct work_struct      service_conn_reaper;
  85         struct timer_list       service_conn_reap_timer;
  86
  87         unsigned int            nr_client_conns;
  88         unsigned int            nr_active_client_conns;
  89         bool                    kill_all_client_conns;
  90         bool                    live;
  91         spinlock_t              client_conn_cache_lock; /* Lock for ->*_client_conns */
  92         spinlock_t              client_conn_discard_lock; /* Prevent multiple discarders */
  93         struct list_head        waiting_client_conns;
  94         struct list_head        active_client_conns;
  95         struct list_head        idle_client_conns;
  96         struct work_struct      client_conn_reaper;
  97         struct timer_list       client_conn_reap_timer;
  98
  99         struct list_head        local_endpoints;
 100         struct mutex            local_mutex;    /* Lock for ->local_endpoints */
 101
 102         DECLARE_HASHTABLE       (peer_hash, 10);
 103         spinlock_t              peer_hash_lock; /* Lock for ->peer_hash */
 104
 105 #define RXRPC_KEEPALIVE_TIME 20 /* NAT keepalive time in seconds */
 106         u8                      peer_keepalive_cursor;
 107         ktime_t                 peer_keepalive_base;
 108         struct hlist_head       peer_keepalive[RXRPC_KEEPALIVE_TIME + 1];
 109         struct hlist_head       peer_keepalive_new;
 110         struct timer_list       peer_keepalive_timer;
 111         struct work_struct      peer_keepalive_work;
 112 };
 113
 114 /*
 115  * Service backlog preallocation.
 116  *
 117  * This contains circular buffers of preallocated peers, connections and calls
 118  * for incoming service calls and their head and tail pointers.  This allows
 119  * calls to be set up in the data_ready handler, thereby avoiding the need to
 120  * shuffle packets around so much.
 121  */
 122 struct rxrpc_backlog {
 123         unsigned short          peer_backlog_head;
 124         unsigned short          peer_backlog_tail;
 125         unsigned short          conn_backlog_head;
 126         unsigned short          conn_backlog_tail;
 127         unsigned short          call_backlog_head;
 128         unsigned short          call_backlog_tail;
 129 #define RXRPC_BACKLOG_MAX       32
 130         struct rxrpc_peer       *peer_backlog[RXRPC_BACKLOG_MAX];
 131         struct rxrpc_connection *conn_backlog[RXRPC_BACKLOG_MAX];
 132         struct rxrpc_call       *call_backlog[RXRPC_BACKLOG_MAX];
 133 };
 134
 135 /*
 136  * RxRPC socket definition
 137  */
 138 struct rxrpc_sock {
 139         /* WARNING: sk has to be the first member */
 140         struct sock             sk;
 141         rxrpc_notify_new_call_t notify_new_call; /* Func to notify of new call */
 142         rxrpc_discard_new_call_t discard_new_call; /* Func to discard a new call */
 143         struct rxrpc_local      *local;         /* local endpoint */
 144         struct rxrpc_backlog    *backlog;       /* Preallocation for services */
 145         spinlock_t              incoming_lock;  /* Incoming call vs service shutdown lock */
 146         struct list_head        sock_calls;     /* List of calls owned by this socket */
 147         struct list_head        to_be_accepted; /* calls awaiting acceptance */
 148         struct list_head        recvmsg_q;      /* Calls awaiting recvmsg's attention  */
 149         rwlock_t                recvmsg_lock;   /* Lock for recvmsg_q */
 150         struct key              *key;           /* security for this socket */
 151         struct key              *securities;    /* list of server security descriptors */
 152         struct rb_root          calls;          /* User ID -> call mapping */
 153         unsigned long           flags;
 154 #define RXRPC_SOCK_CONNECTED            0       /* connect_srx is set */
 155         rwlock_t                call_lock;      /* lock for calls */
 156         u32                     min_sec_level;  /* minimum security level */
 157 #define RXRPC_SECURITY_MAX      RXRPC_SECURITY_ENCRYPT
 158         bool                    exclusive;      /* Exclusive connection for a client socket */
 159         u16                     second_service; /* Additional service bound to the endpoint */
 160         struct {
 161                 /* Service upgrade information */
 162                 u16             from;           /* Service ID to upgrade (if not 0) */
 163                 u16             to;             /* service ID to upgrade to */
 164         } service_upgrade;
 165         sa_family_t             family;         /* Protocol family created with */
 166         struct sockaddr_rxrpc   srx;            /* Primary Service/local addresses */
 167         struct sockaddr_rxrpc   connect_srx;    /* Default client address from connect() */
 168 };
 169
 170 #define rxrpc_sk(__sk) container_of((__sk), struct rxrpc_sock, sk)
 171
 172 /*
 173  * CPU-byteorder normalised Rx packet header.
 174  */
 175 struct rxrpc_host_header {
 176         u32             epoch;          /* client boot timestamp */
 177         u32             cid;            /* connection and channel ID */
 178         u32             callNumber;     /* call ID (0 for connection-level packets) */
 179         u32             seq;            /* sequence number of pkt in call stream */
 180         u32             serial;         /* serial number of pkt sent to network */
 181         u8              type;           /* packet type */
 182         u8              flags;          /* packet flags */
 183         u8              userStatus;     /* app-layer defined status */
 184         u8              securityIndex;  /* security protocol ID */
 185         union {
 186                 u16     _rsvd;          /* reserved */
 187                 u16     cksum;          /* kerberos security checksum */
 188         };
 189         u16             serviceId;      /* service ID */
 190 } __packed;
 191
 192 /*
 193  * RxRPC socket buffer private variables
 194  * - max 48 bytes (struct sk_buff::cb)
 195  */
 196 struct rxrpc_skb_priv {
 197         union {
 198                 u8              nr_jumbo;       /* Number of jumbo subpackets */
 199         };
 200         union {
 201                 int             remain;         /* amount of space remaining for next write */
 202         };
 203
 204         struct rxrpc_host_header hdr;           /* RxRPC packet header from this packet */
 205 };
 206
 207 #define rxrpc_skb(__skb) ((struct rxrpc_skb_priv *) &(__skb)->cb)
 208
 209 /*
 210  * RxRPC security module interface
 211  */
 212 struct rxrpc_security {
 213         const char              *name;          /* name of this service */
 214         u8                      security_index; /* security type provided */
 215
 216         /* Initialise a security service */
 217         int (*init)(void);
 218
 219         /* Clean up a security service */
 220         void (*exit)(void);
 221
 222         /* initialise a connection's security */
 223         int (*init_connection_security)(struct rxrpc_connection *);
 224
 225         /* prime a connection's packet security */
 226         int (*prime_packet_security)(struct rxrpc_connection *);
 227
 228         /* impose security on a packet */
 229         int (*secure_packet)(struct rxrpc_call *,
 230                              struct sk_buff *,
 231                              size_t,
 232                              void *);
 233
 234         /* verify the security on a received packet */
 235         int (*verify_packet)(struct rxrpc_call *, struct sk_buff *,
 236                              unsigned int, unsigned int, rxrpc_seq_t, u16);
 237
 238         /* Locate the data in a received packet that has been verified. */
 239         void (*locate_data)(struct rxrpc_call *, struct sk_buff *,
 240                             unsigned int *, unsigned int *);
 241
 242         /* issue a challenge */
 243         int (*issue_challenge)(struct rxrpc_connection *);
 244
 245         /* respond to a challenge */
 246         int (*respond_to_challenge)(struct rxrpc_connection *,
 247                                     struct sk_buff *,
 248                                     u32 *);
 249
 250         /* verify a response */
 251         int (*verify_response)(struct rxrpc_connection *,
 252                                struct sk_buff *,
 253                                u32 *);
 254
 255         /* clear connection security */
 256         void (*clear)(struct rxrpc_connection *);
 257 };
 258
 259 /*
 260  * RxRPC local transport endpoint description
 261  * - owned by a single AF_RXRPC socket
 262  * - pointed to by transport socket struct sk_user_data
 263  */
 264 struct rxrpc_local {
 265         struct rcu_head         rcu;
 266         atomic_t                usage;
 267         struct rxrpc_net        *rxnet;         /* The network ns in which this resides */
 268         struct list_head        link;
 269         struct socket           *socket;        /* my UDP socket */
 270         struct work_struct      processor;
 271         struct rxrpc_sock __rcu *service;       /* Service(s) listening on this endpoint */
 272         struct rw_semaphore     defrag_sem;     /* control re-enablement of IP DF bit */
 273         struct sk_buff_head     reject_queue;   /* packets awaiting rejection */
 274         struct sk_buff_head     event_queue;    /* endpoint event packets awaiting processing */
 275         struct rb_root          client_conns;   /* Client connections by socket params */
 276         spinlock_t              client_conns_lock; /* Lock for client_conns */
 277         spinlock_t              lock;           /* access lock */
 278         rwlock_t                services_lock;  /* lock for services list */
 279         int                     debug_id;       /* debug ID for printks */
 280         bool                    dead;
 281         bool                    service_closed; /* Service socket closed */
 282         struct sockaddr_rxrpc   srx;            /* local address */
 283 };
 284
 285 /*
 286  * RxRPC remote transport endpoint definition
 287  * - matched by local endpoint, remote port, address and protocol type
 288  */
 289 struct rxrpc_peer {
 290         struct rcu_head         rcu;            /* This must be first */
 291         atomic_t                usage;
 292         unsigned long           hash_key;
 293         struct hlist_node       hash_link;
 294         struct rxrpc_local      *local;
 295         struct hlist_head       error_targets;  /* targets for net error distribution */
 296         struct work_struct      error_distributor;
 297         struct rb_root          service_conns;  /* Service connections */
 298         struct hlist_node       keepalive_link; /* Link in net->peer_keepalive[] */
 299         time64_t                last_tx_at;     /* Last time packet sent here */
 300         seqlock_t               service_conn_lock;
 301         spinlock_t              lock;           /* access lock */
 302         unsigned int            if_mtu;         /* interface MTU for this peer */
 303         unsigned int            mtu;            /* network MTU for this peer */
 304         unsigned int            maxdata;        /* data size (MTU - hdrsize) */
 305         unsigned short          hdrsize;        /* header size (IP + UDP + RxRPC) */
 306         int                     debug_id;       /* debug ID for printks */
 307         int                     error_report;   /* Net (+0) or local (+1000000) to distribute */
 308 #define RXRPC_LOCAL_ERROR_OFFSET 1000000
 309         struct sockaddr_rxrpc   srx;            /* remote address */
 310
 311         /* calculated RTT cache */
 312 #define RXRPC_RTT_CACHE_SIZE 32
 313         ktime_t                 rtt_last_req;   /* Time of last RTT request */
 314         u64                     rtt;            /* Current RTT estimate (in nS) */
 315         u64                     rtt_sum;        /* Sum of cache contents */
 316         u64                     rtt_cache[RXRPC_RTT_CACHE_SIZE]; /* Determined RTT cache */
 317         u8                      rtt_cursor;     /* next entry at which to insert */
 318         u8                      rtt_usage;      /* amount of cache actually used */
 319
 320         u8                      cong_cwnd;      /* Congestion window size */
 321 };
 322
 323 /*
 324  * Keys for matching a connection.
 325  */
 326 struct rxrpc_conn_proto {
 327         union {
 328                 struct {
 329                         u32     epoch;          /* epoch of this connection */
 330                         u32     cid;            /* connection ID */
 331                 };
 332                 u64             index_key;
 333         };
 334 };
 335
 336 struct rxrpc_conn_parameters {
 337         struct rxrpc_local      *local;         /* Representation of local endpoint */
 338         struct rxrpc_peer       *peer;          /* Remote endpoint */
 339         struct key              *key;           /* Security details */
 340         bool                    exclusive;      /* T if conn is exclusive */
 341         bool                    upgrade;        /* T if service ID can be upgraded */
 342         u16                     service_id;     /* Service ID for this connection */
 343         u32                     security_level; /* Security level selected */
 344 };
 345
 346 /*
 347  * Bits in the connection flags.
 348  */
 349 enum rxrpc_conn_flag {
 350         RXRPC_CONN_HAS_IDR,             /* Has a client conn ID assigned */
 351         RXRPC_CONN_IN_SERVICE_CONNS,    /* Conn is in peer->service_conns */
 352         RXRPC_CONN_IN_CLIENT_CONNS,     /* Conn is in local->client_conns */
 353         RXRPC_CONN_EXPOSED,             /* Conn has extra ref for exposure */
 354         RXRPC_CONN_DONT_REUSE,          /* Don't reuse this connection */
 355         RXRPC_CONN_COUNTED,             /* Counted by rxrpc_nr_client_conns */
 356         RXRPC_CONN_PROBING_FOR_UPGRADE, /* Probing for service upgrade */
 357         RXRPC_CONN_FINAL_ACK_0,         /* Need final ACK for channel 0 */
 358         RXRPC_CONN_FINAL_ACK_1,         /* Need final ACK for channel 1 */
 359         RXRPC_CONN_FINAL_ACK_2,         /* Need final ACK for channel 2 */
 360         RXRPC_CONN_FINAL_ACK_3,         /* Need final ACK for channel 3 */
 361 };
 362
 363 #define RXRPC_CONN_FINAL_ACK_MASK ((1UL << RXRPC_CONN_FINAL_ACK_0) |    \
 364                                    (1UL << RXRPC_CONN_FINAL_ACK_1) |    \
 365                                    (1UL << RXRPC_CONN_FINAL_ACK_2) |    \
 366                                    (1UL << RXRPC_CONN_FINAL_ACK_3))
 367
 368 /*
 369  * Events that can be raised upon a connection.
 370  */
 371 enum rxrpc_conn_event {
 372         RXRPC_CONN_EV_CHALLENGE,        /* Send challenge packet */
 373 };
 374
 375 /*
 376  * The connection cache state.
 377  */
 378 enum rxrpc_conn_cache_state {
 379         RXRPC_CONN_CLIENT_INACTIVE,     /* Conn is not yet listed */
 380         RXRPC_CONN_CLIENT_WAITING,      /* Conn is on wait list, waiting for capacity */
 381         RXRPC_CONN_CLIENT_ACTIVE,       /* Conn is on active list, doing calls */
 382         RXRPC_CONN_CLIENT_UPGRADE,      /* Conn is on active list, probing for upgrade */
 383         RXRPC_CONN_CLIENT_CULLED,       /* Conn is culled and delisted, doing calls */
 384         RXRPC_CONN_CLIENT_IDLE,         /* Conn is on idle list, doing mostly nothing */
 385         RXRPC_CONN__NR_CACHE_STATES
 386 };
 387
 388 /*
 389  * The connection protocol state.
 390  */
 391 enum rxrpc_conn_proto_state {
 392         RXRPC_CONN_UNUSED,              /* Connection not yet attempted */
 393         RXRPC_CONN_CLIENT,              /* Client connection */
 394         RXRPC_CONN_SERVICE_PREALLOC,    /* Service connection preallocation */
 395         RXRPC_CONN_SERVICE_UNSECURED,   /* Service unsecured connection */
 396         RXRPC_CONN_SERVICE_CHALLENGING, /* Service challenging for security */
 397         RXRPC_CONN_SERVICE,             /* Service secured connection */
 398         RXRPC_CONN_REMOTELY_ABORTED,    /* Conn aborted by peer */
 399         RXRPC_CONN_LOCALLY_ABORTED,     /* Conn aborted locally */
 400         RXRPC_CONN__NR_STATES
 401 };
 402
 403 /*
 404  * RxRPC connection definition
 405  * - matched by { local, peer, epoch, conn_id, direction }
 406  * - each connection can only handle four simultaneous calls
 407  */
 408 struct rxrpc_connection {
 409         struct rxrpc_conn_proto proto;
 410         struct rxrpc_conn_parameters params;
 411
 412         atomic_t                usage;
 413         struct rcu_head         rcu;
 414         struct list_head        cache_link;
 415
 416         spinlock_t              channel_lock;
 417         unsigned char           active_chans;   /* Mask of active channels */
 418 #define RXRPC_ACTIVE_CHANS_MASK ((1 << RXRPC_MAXCALLS) - 1)
 419         struct list_head        waiting_calls;  /* Calls waiting for channels */
 420         struct rxrpc_channel {
 421                 unsigned long           final_ack_at;   /* Time at which to issue final ACK */
 422                 struct rxrpc_call __rcu *call;          /* Active call */
 423                 unsigned int            call_debug_id;  /* call->debug_id */
 424                 u32                     call_id;        /* ID of current call */
 425                 u32                     call_counter;   /* Call ID counter */
 426                 u32                     last_call;      /* ID of last call */
 427                 u8                      last_type;      /* Type of last packet */
 428                 union {
 429                         u32             last_seq;
 430                         u32             last_abort;
 431                 };
 432         } channels[RXRPC_MAXCALLS];
 433
 434         struct timer_list       timer;          /* Conn event timer */
 435         struct work_struct      processor;      /* connection event processor */
 436         union {
 437                 struct rb_node  client_node;    /* Node in local->client_conns */
 438                 struct rb_node  service_node;   /* Node in peer->service_conns */
 439         };
 440         struct list_head        proc_link;      /* link in procfs list */
 441         struct list_head        link;           /* link in master connection list */
 442         struct sk_buff_head     rx_queue;       /* received conn-level packets */
 443         const struct rxrpc_security *security;  /* applied security module */
 444         struct key              *server_key;    /* security for this service */
 445         struct crypto_skcipher  *cipher;        /* encryption handle */
 446         struct rxrpc_crypt      csum_iv;        /* packet checksum base */
 447         unsigned long           flags;
 448         unsigned long           events;
 449         unsigned long           idle_timestamp; /* Time at which last became idle */
 450         spinlock_t              state_lock;     /* state-change lock */
 451         enum rxrpc_conn_cache_state cache_state;
 452         enum rxrpc_conn_proto_state state;      /* current state of connection */
 453         u32                     local_abort;    /* local abort code */
 454         u32                     remote_abort;   /* remote abort code */
 455         int                     debug_id;       /* debug ID for printks */
 456         atomic_t                serial;         /* packet serial number counter */
 457         unsigned int            hi_serial;      /* highest serial number received */
 458         u32                     security_nonce; /* response re-use preventer */
 459         u16                     service_id;     /* Service ID, possibly upgraded */
 460         u8                      size_align;     /* data size alignment (for security) */
 461         u8                      security_size;  /* security header size */
 462         u8                      security_ix;    /* security type */
 463         u8                      out_clientflag; /* RXRPC_CLIENT_INITIATED if we are client */
 464 };
 465
 466 /*
 467  * Flags in call->flags.
 468  */
 469 enum rxrpc_call_flag {
 470         RXRPC_CALL_RELEASED,            /* call has been released - no more message to userspace */
 471         RXRPC_CALL_HAS_USERID,          /* has a user ID attached */
 472         RXRPC_CALL_IS_SERVICE,          /* Call is service call */
 473         RXRPC_CALL_EXPOSED,             /* The call was exposed to the world */
 474         RXRPC_CALL_RX_LAST,             /* Received the last packet (at rxtx_top) */
 475         RXRPC_CALL_TX_LAST,             /* Last packet in Tx buffer (at rxtx_top) */
 476         RXRPC_CALL_TX_LASTQ,            /* Last packet has been queued */
 477         RXRPC_CALL_SEND_PING,           /* A ping will need to be sent */
 478         RXRPC_CALL_PINGING,             /* Ping in process */
 479         RXRPC_CALL_RETRANS_TIMEOUT,     /* Retransmission due to timeout occurred */
 480         RXRPC_CALL_BEGAN_RX_TIMER,      /* We began the expect_rx_by timer */
 481         RXRPC_CALL_RX_HEARD,            /* The peer responded at least once to this call */
 482 };
 483
 484 /*
 485  * Events that can be raised on a call.
 486  */
 487 enum rxrpc_call_event {
 488         RXRPC_CALL_EV_ACK,              /* need to generate ACK */
 489         RXRPC_CALL_EV_ABORT,            /* need to generate abort */
 490         RXRPC_CALL_EV_RESEND,           /* Tx resend required */
 491         RXRPC_CALL_EV_PING,             /* Ping send required */
 492         RXRPC_CALL_EV_EXPIRED,          /* Expiry occurred */
 493         RXRPC_CALL_EV_ACK_LOST,         /* ACK may be lost, send ping */
 494 };
 495
 496 /*
 497  * The states that a call can be in.
 498  */
 499 enum rxrpc_call_state {
 500         RXRPC_CALL_UNINITIALISED,
 501         RXRPC_CALL_CLIENT_AWAIT_CONN,   /* - client waiting for connection to become available */
 502         RXRPC_CALL_CLIENT_SEND_REQUEST, /* - client sending request phase */
 503         RXRPC_CALL_CLIENT_AWAIT_REPLY,  /* - client awaiting reply */
 504         RXRPC_CALL_CLIENT_RECV_REPLY,   /* - client receiving reply phase */
 505         RXRPC_CALL_SERVER_PREALLOC,     /* - service preallocation */
 506         RXRPC_CALL_SERVER_SECURING,     /* - server securing request connection */
 507         RXRPC_CALL_SERVER_ACCEPTING,    /* - server accepting request */
 508         RXRPC_CALL_SERVER_RECV_REQUEST, /* - server receiving request */
 509         RXRPC_CALL_SERVER_ACK_REQUEST,  /* - server pending ACK of request */
 510         RXRPC_CALL_SERVER_SEND_REPLY,   /* - server sending reply */
 511         RXRPC_CALL_SERVER_AWAIT_ACK,    /* - server awaiting final ACK */
 512         RXRPC_CALL_COMPLETE,            /* - call complete */
 513         NR__RXRPC_CALL_STATES
 514 };
 515
 516 /*
 517  * Call Tx congestion management modes.
 518  */
 519 enum rxrpc_congest_mode {
 520         RXRPC_CALL_SLOW_START,
 521         RXRPC_CALL_CONGEST_AVOIDANCE,
 522         RXRPC_CALL_PACKET_LOSS,
 523         RXRPC_CALL_FAST_RETRANSMIT,
 524         NR__RXRPC_CONGEST_MODES
 525 };
 526
 527 /*
 528  * RxRPC call definition
 529  * - matched by { connection, call_id }
 530  */
 531 struct rxrpc_call {
 532         struct rcu_head         rcu;
 533         struct rxrpc_connection *conn;          /* connection carrying call */
 534         struct rxrpc_peer       *peer;          /* Peer record for remote address */
 535         struct rxrpc_sock __rcu *socket;        /* socket responsible */
 536         struct rxrpc_net        *rxnet;         /* Network namespace to which call belongs */
 537         struct mutex            user_mutex;     /* User access mutex */
 538         unsigned long           ack_at;         /* When deferred ACK needs to happen */
 539         unsigned long           ack_lost_at;    /* When ACK is figured as lost */
 540         unsigned long           resend_at;      /* When next resend needs to happen */
 541         unsigned long           ping_at;        /* When next to send a ping */
 542         unsigned long           keepalive_at;   /* When next to send a keepalive ping */
 543         unsigned long           expect_rx_by;   /* When we expect to get a packet by */
 544         unsigned long           expect_req_by;  /* When we expect to get a request DATA packet by */
 545         unsigned long           expect_term_by; /* When we expect call termination by */
 546         u32                     next_rx_timo;   /* Timeout for next Rx packet (jif) */
 547         u32                     next_req_timo;  /* Timeout for next Rx request packet (jif) */
 548         struct timer_list       timer;          /* Combined event timer */
 549         struct work_struct      processor;      /* Event processor */
 550         rxrpc_notify_rx_t       notify_rx;      /* kernel service Rx notification function */
 551         struct list_head        link;           /* link in master call list */
 552         struct list_head        chan_wait_link; /* Link in conn->waiting_calls */
 553         struct hlist_node       error_link;     /* link in error distribution list */
 554         struct list_head        accept_link;    /* Link in rx->acceptq */
 555         struct list_head        recvmsg_link;   /* Link in rx->recvmsg_q */
 556         struct list_head        sock_link;      /* Link in rx->sock_calls */
 557         struct rb_node          sock_node;      /* Node in rx->calls */
 558         struct sk_buff          *tx_pending;    /* Tx socket buffer being filled */
 559         wait_queue_head_t       waitq;          /* Wait queue for channel or Tx */
 560         s64                     tx_total_len;   /* Total length left to be transmitted (or -1) */
 561         __be32                  crypto_buf[2];  /* Temporary packet crypto buffer */
 562         unsigned long           user_call_ID;   /* user-defined call ID */
 563         unsigned long           flags;
 564         unsigned long           events;
 565         spinlock_t              lock;
 566         spinlock_t              notify_lock;    /* Kernel notification lock */
 567         rwlock_t                state_lock;     /* lock for state transition */
 568         u32                     abort_code;     /* Local/remote abort code */
 569         int                     error;          /* Local error incurred */
 570         enum rxrpc_call_state   state;          /* current state of call */
 571         enum rxrpc_call_completion completion;  /* Call completion condition */
 572         atomic_t                usage;
 573         u16                     service_id;     /* service ID */
 574         u8                      security_ix;    /* Security type */
 575         u32                     call_id;        /* call ID on connection  */
 576         u32                     cid;            /* connection ID plus channel index */
 577         int                     debug_id;       /* debug ID for printks */
 578         unsigned short          rx_pkt_offset;  /* Current recvmsg packet offset */
 579         unsigned short          rx_pkt_len;     /* Current recvmsg packet len */
 580
 581         /* Rx/Tx circular buffer, depending on phase.
 582          *
 583          * In the Rx phase, packets are annotated with 0 or the number of the
 584          * segment of a jumbo packet each buffer refers to.  There can be up to
 585          * 47 segments in a maximum-size UDP packet.
 586          *
 587          * In the Tx phase, packets are annotated with which buffers have been
 588          * acked.
 589          */
 590 #define RXRPC_RXTX_BUFF_SIZE    64
 591 #define RXRPC_RXTX_BUFF_MASK    (RXRPC_RXTX_BUFF_SIZE - 1)
 592 #define RXRPC_INIT_RX_WINDOW_SIZE 32
 593         struct sk_buff          **rxtx_buffer;
 594         u8                      *rxtx_annotations;
 595 #define RXRPC_TX_ANNO_ACK       0
 596 #define RXRPC_TX_ANNO_UNACK     1
 597 #define RXRPC_TX_ANNO_NAK       2
 598 #define RXRPC_TX_ANNO_RETRANS   3
 599 #define RXRPC_TX_ANNO_MASK      0x03
 600 #define RXRPC_TX_ANNO_LAST      0x04
 601 #define RXRPC_TX_ANNO_RESENT    0x08
 602
 603 #define RXRPC_RX_ANNO_JUMBO     0x3f            /* Jumbo subpacket number + 1 if not zero */
 604 #define RXRPC_RX_ANNO_JLAST     0x40            /* Set if last element of a jumbo packet */
 605 #define RXRPC_RX_ANNO_VERIFIED  0x80            /* Set if verified and decrypted */
 606         rxrpc_seq_t             tx_hard_ack;    /* Dead slot in buffer; the first transmitted but
 607                                                  * not hard-ACK'd packet follows this.
 608                                                  */
 609         rxrpc_seq_t             tx_top;         /* Highest Tx slot allocated. */
 610
 611         /* TCP-style slow-start congestion control [RFC5681].  Since the SMSS
 612          * is fixed, we keep these numbers in terms of segments (ie. DATA
 613          * packets) rather than bytes.
 614          */
 615 #define RXRPC_TX_SMSS           RXRPC_JUMBO_DATALEN
 616         u8                      cong_cwnd;      /* Congestion window size */
 617         u8                      cong_extra;     /* Extra to send for congestion management */
 618         u8                      cong_ssthresh;  /* Slow-start threshold */
 619         enum rxrpc_congest_mode cong_mode:8;    /* Congestion management mode */
 620         u8                      cong_dup_acks;  /* Count of ACKs showing missing packets */
 621         u8                      cong_cumul_acks; /* Cumulative ACK count */
 622         ktime_t                 cong_tstamp;    /* Last time cwnd was changed */
 623
 624         rxrpc_seq_t             rx_hard_ack;    /* Dead slot in buffer; the first received but not
 625                                                  * consumed packet follows this.
 626                                                  */
 627         rxrpc_seq_t             rx_top;         /* Highest Rx slot allocated. */
 628         rxrpc_seq_t             rx_expect_next; /* Expected next packet sequence number */
 629         rxrpc_serial_t          rx_serial;      /* Highest serial received for this call */
 630         u8                      rx_winsize;     /* Size of Rx window */
 631         u8                      tx_winsize;     /* Maximum size of Tx window */
 632         bool                    tx_phase;       /* T if transmission phase, F if receive phase */
 633         u8                      nr_jumbo_bad;   /* Number of jumbo dups/exceeds-windows */
 634
 635         /* receive-phase ACK management */
 636         u8                      ackr_reason;    /* reason to ACK */
 637         u16                     ackr_skew;      /* skew on packet being ACK'd */
 638         rxrpc_serial_t          ackr_serial;    /* serial of packet being ACK'd */
 639         rxrpc_seq_t             ackr_prev_seq;  /* previous sequence number received */
 640         rxrpc_seq_t             ackr_consumed;  /* Highest packet shown consumed */
 641         rxrpc_seq_t             ackr_seen;      /* Highest packet shown seen */
 642
 643         /* ping management */
 644         rxrpc_serial_t          ping_serial;    /* Last ping sent */
 645         ktime_t                 ping_time;      /* Time last ping sent */
 646
 647         /* transmission-phase ACK management */
 648         ktime_t                 acks_latest_ts; /* Timestamp of latest ACK received */
 649         rxrpc_serial_t          acks_latest;    /* serial number of latest ACK received */
 650         rxrpc_seq_t             acks_lowest_nak; /* Lowest NACK in the buffer (or ==tx_hard_ack) */
 651         rxrpc_seq_t             acks_lost_top;  /* tx_top at the time lost-ack ping sent */
 652         rxrpc_serial_t          acks_lost_ping; /* Serial number of probe ACK */
 653 };
 654
 655 /*
 656  * Summary of a new ACK and the changes it made to the Tx buffer packet states.
 657  */
 658 struct rxrpc_ack_summary {
 659         u8                      ack_reason;
 660         u8                      nr_acks;                /* Number of ACKs in packet */
 661         u8                      nr_nacks;               /* Number of NACKs in packet */
 662         u8                      nr_new_acks;            /* Number of new ACKs in packet */
 663         u8                      nr_new_nacks;           /* Number of new NACKs in packet */
 664         u8                      nr_rot_new_acks;        /* Number of rotated new ACKs */
 665         bool                    new_low_nack;           /* T if new low NACK found */
 666         bool                    retrans_timeo;          /* T if reTx due to timeout happened */
 667         u8                      flight_size;            /* Number of unreceived transmissions */
 668         /* Place to stash values for tracing */
 669         enum rxrpc_congest_mode mode:8;
 670         u8                      cwnd;
 671         u8                      ssthresh;
 672         u8                      dup_acks;
 673         u8                      cumulative_acks;
 674 };
 675
 676 /*
 677  * sendmsg() cmsg-specified parameters.
 678  */
 679 enum rxrpc_command {
 680         RXRPC_CMD_SEND_DATA,            /* send data message */
 681         RXRPC_CMD_SEND_ABORT,           /* request abort generation */
 682         RXRPC_CMD_ACCEPT,               /* [server] accept incoming call */
 683         RXRPC_CMD_REJECT_BUSY,          /* [server] reject a call as busy */
 684 };
 685
 686 struct rxrpc_call_params {
 687         s64                     tx_total_len;   /* Total Tx data length (if send data) */
 688         unsigned long           user_call_ID;   /* User's call ID */
 689         struct {
 690                 u32             hard;           /* Maximum lifetime (sec) */
 691                 u32             idle;           /* Max time since last data packet (msec) */
 692                 u32             normal;         /* Max time since last call packet (msec) */
 693         } timeouts;
 694         u8                      nr_timeouts;    /* Number of timeouts specified */
 695 };
 696
 697 struct rxrpc_send_params {
 698         struct rxrpc_call_params call;
 699         u32                     abort_code;     /* Abort code to Tx (if abort) */
 700         enum rxrpc_command      command : 8;    /* The command to implement */
 701         bool                    exclusive;      /* Shared or exclusive call */
 702         bool                    upgrade;        /* If the connection is upgradeable */
 703 };
 704
 705 #include <trace/events/rxrpc.h>
 706
 707 /*
 708  * af_rxrpc.c
 709  */
 710 extern atomic_t rxrpc_n_tx_skbs, rxrpc_n_rx_skbs;
 711 extern struct workqueue_struct *rxrpc_workqueue;
 712
 713 /*
 714  * call_accept.c
 715  */
 716 int rxrpc_service_prealloc(struct rxrpc_sock *, gfp_t);
 717 void rxrpc_discard_prealloc(struct rxrpc_sock *);
 718 struct rxrpc_call *rxrpc_new_incoming_call(struct rxrpc_local *,
 719                                            struct rxrpc_connection *,
 720                                            struct sk_buff *);
 721 void rxrpc_accept_incoming_calls(struct rxrpc_local *);
 722 struct rxrpc_call *rxrpc_accept_call(struct rxrpc_sock *, unsigned long,
 723                                      rxrpc_notify_rx_t);
 724 int rxrpc_reject_call(struct rxrpc_sock *);
 725
 726 /*
 727  * call_event.c
 728  */
 729 void rxrpc_propose_ACK(struct rxrpc_call *, u8, u16, u32, bool, bool,
 730                        enum rxrpc_propose_ack_trace);
 731 void rxrpc_process_call(struct work_struct *);
 732
 733 static inline void rxrpc_reduce_call_timer(struct rxrpc_call *call,
 734                                            unsigned long expire_at,
 735                                            unsigned long now,
 736                                            enum rxrpc_timer_trace why)
 737 {
 738         trace_rxrpc_timer(call, why, now);
 739         timer_reduce(&call->timer, expire_at);
 740 }
 741
 742 /*
 743  * call_object.c
 744  */
 745 extern const char *const rxrpc_call_states[];
 746 extern const char *const rxrpc_call_completions[];
 747 extern unsigned int rxrpc_max_call_lifetime;
 748 extern struct kmem_cache *rxrpc_call_jar;
 749
 750 struct rxrpc_call *rxrpc_find_call_by_user_ID(struct rxrpc_sock *, unsigned long);
 751 struct rxrpc_call *rxrpc_alloc_call(struct rxrpc_sock *, gfp_t, unsigned int);
 752 struct rxrpc_call *rxrpc_new_client_call(struct rxrpc_sock *,
 753                                          struct rxrpc_conn_parameters *,
 754                                          struct sockaddr_rxrpc *,
 755                                          struct rxrpc_call_params *, gfp_t,
 756                                          unsigned int);
 757 int rxrpc_retry_client_call(struct rxrpc_sock *,
 758                             struct rxrpc_call *,
 759                             struct rxrpc_conn_parameters *,
 760                             struct sockaddr_rxrpc *,
 761                             gfp_t);
 762 void rxrpc_incoming_call(struct rxrpc_sock *, struct rxrpc_call *,
 763                          struct sk_buff *);
 764 void rxrpc_release_call(struct rxrpc_sock *, struct rxrpc_call *);
 765 int rxrpc_prepare_call_for_retry(struct rxrpc_sock *, struct rxrpc_call *);
 766 void rxrpc_release_calls_on_socket(struct rxrpc_sock *);
 767 bool __rxrpc_queue_call(struct rxrpc_call *);
 768 bool rxrpc_queue_call(struct rxrpc_call *);
 769 void rxrpc_see_call(struct rxrpc_call *);
 770 void rxrpc_get_call(struct rxrpc_call *, enum rxrpc_call_trace);
 771 void rxrpc_put_call(struct rxrpc_call *, enum rxrpc_call_trace);
 772 void rxrpc_cleanup_call(struct rxrpc_call *);
 773 void rxrpc_destroy_all_calls(struct rxrpc_net *);
 774
 775 static inline bool rxrpc_is_service_call(const struct rxrpc_call *call)
 776 {
 777         return test_bit(RXRPC_CALL_IS_SERVICE, &call->flags);
 778 }
 779
 780 static inline bool rxrpc_is_client_call(const struct rxrpc_call *call)
 781 {
 782         return !rxrpc_is_service_call(call);
 783 }
 784
 785 /*
 786  * Transition a call to the complete state.
 787  */
 788 static inline bool __rxrpc_set_call_completion(struct rxrpc_call *call,
 789                                                enum rxrpc_call_completion compl,
 790                                                u32 abort_code,
 791                                                int error)
 792 {
 793         if (call->state < RXRPC_CALL_COMPLETE) {
 794                 call->abort_code = abort_code;
 795                 call->error = error;
 796                 call->completion = compl,
 797                 call->state = RXRPC_CALL_COMPLETE;
 798                 trace_rxrpc_call_complete(call);
 799                 wake_up(&call->waitq);
 800                 return true;
 801         }
 802         return false;
 803 }
 804
 805 static inline bool rxrpc_set_call_completion(struct rxrpc_call *call,
 806                                              enum rxrpc_call_completion compl,
 807                                              u32 abort_code,
 808                                              int error)
 809 {
 810         bool ret;
 811
 812         write_lock_bh(&call->state_lock);
 813         ret = __rxrpc_set_call_completion(call, compl, abort_code, error);
 814         write_unlock_bh(&call->state_lock);
 815         return ret;
 816 }
 817
 818 /*
 819  * Record that a call successfully completed.
 820  */
 821 static inline bool __rxrpc_call_completed(struct rxrpc_call *call)
 822 {
 823         return __rxrpc_set_call_completion(call, RXRPC_CALL_SUCCEEDED, 0, 0);
 824 }
 825
 826 static inline bool rxrpc_call_completed(struct rxrpc_call *call)
 827 {
 828         bool ret;
 829
 830         write_lock_bh(&call->state_lock);
 831         ret = __rxrpc_call_completed(call);
 832         write_unlock_bh(&call->state_lock);
 833         return ret;
 834 }
 835
 836 /*
 837  * Record that a call is locally aborted.
 838  */
 839 static inline bool __rxrpc_abort_call(const char *why, struct rxrpc_call *call,
 840                                       rxrpc_seq_t seq,
 841                                       u32 abort_code, int error)
 842 {
 843         trace_rxrpc_abort(call->debug_id, why, call->cid, call->call_id, seq,
 844                           abort_code, error);
 845         return __rxrpc_set_call_completion(call, RXRPC_CALL_LOCALLY_ABORTED,
 846                                            abort_code, error);
 847 }
 848
 849 static inline bool rxrpc_abort_call(const char *why, struct rxrpc_call *call,
 850                                     rxrpc_seq_t seq, u32 abort_code, int error)
 851 {
 852         bool ret;
 853
 854         write_lock_bh(&call->state_lock);
 855         ret = __rxrpc_abort_call(why, call, seq, abort_code, error);
 856         write_unlock_bh(&call->state_lock);
 857         return ret;
 858 }
 859
 860 /*
 861  * Abort a call due to a protocol error.
 862  */
 863 static inline bool __rxrpc_abort_eproto(struct rxrpc_call *call,
 864                                         struct sk_buff *skb,
 865                                         const char *eproto_why,
 866                                         const char *why,
 867                                         u32 abort_code)
 868 {
 869         struct rxrpc_skb_priv *sp = rxrpc_skb(skb);
 870
 871         trace_rxrpc_rx_eproto(call, sp->hdr.serial, eproto_why);
 872         return rxrpc_abort_call(why, call, sp->hdr.seq, abort_code, -EPROTO);
 873 }
 874
 875 #define rxrpc_abort_eproto(call, skb, eproto_why, abort_why, abort_code) \
 876         __rxrpc_abort_eproto((call), (skb), tracepoint_string(eproto_why), \
 877                              (abort_why), (abort_code))
 878
 879 /*
 880  * conn_client.c
 881  */
 882 extern unsigned int rxrpc_max_client_connections;
 883 extern unsigned int rxrpc_reap_client_connections;
 884 extern unsigned long rxrpc_conn_idle_client_expiry;
 885 extern unsigned long rxrpc_conn_idle_client_fast_expiry;
 886 extern struct idr rxrpc_client_conn_ids;
 887
 888 void rxrpc_destroy_client_conn_ids(void);
 889 int rxrpc_connect_call(struct rxrpc_call *, struct rxrpc_conn_parameters *,
 890                        struct sockaddr_rxrpc *, gfp_t);
 891 void rxrpc_expose_client_call(struct rxrpc_call *);
 892 void rxrpc_disconnect_client_call(struct rxrpc_call *);
 893 void rxrpc_put_client_conn(struct rxrpc_connection *);
 894 void rxrpc_discard_expired_client_conns(struct work_struct *);
 895 void rxrpc_destroy_all_client_connections(struct rxrpc_net *);
 896
 897 /*
 898  * conn_event.c
 899  */
 900 void rxrpc_process_connection(struct work_struct *);
 901
 902 /*
 903  * conn_object.c
 904  */
 905 extern unsigned int rxrpc_connection_expiry;
 906 extern unsigned int rxrpc_closed_conn_expiry;
 907
 908 struct rxrpc_connection *rxrpc_alloc_connection(gfp_t);
 909 struct rxrpc_connection *rxrpc_find_connection_rcu(struct rxrpc_local *,
 910                                                    struct sk_buff *);
 911 void __rxrpc_disconnect_call(struct rxrpc_connection *, struct rxrpc_call *);
 912 void rxrpc_disconnect_call(struct rxrpc_call *);
 913 void rxrpc_kill_connection(struct rxrpc_connection *);
 914 bool rxrpc_queue_conn(struct rxrpc_connection *);
 915 void rxrpc_see_connection(struct rxrpc_connection *);
 916 void rxrpc_get_connection(struct rxrpc_connection *);
 917 struct rxrpc_connection *rxrpc_get_connection_maybe(struct rxrpc_connection *);
 918 void rxrpc_put_service_conn(struct rxrpc_connection *);
 919 void rxrpc_service_connection_reaper(struct work_struct *);
 920 void rxrpc_destroy_all_connections(struct rxrpc_net *);
 921
 922 static inline bool rxrpc_conn_is_client(const struct rxrpc_connection *conn)
 923 {
 924         return conn->out_clientflag;
 925 }
 926
 927 static inline bool rxrpc_conn_is_service(const struct rxrpc_connection *conn)
 928 {
 929         return !rxrpc_conn_is_client(conn);
 930 }
 931
 932 static inline void rxrpc_put_connection(struct rxrpc_connection *conn)
 933 {
 934         if (!conn)
 935                 return;
 936
 937         if (rxrpc_conn_is_client(conn))
 938                 rxrpc_put_client_conn(conn);
 939         else
 940                 rxrpc_put_service_conn(conn);
 941 }
 942
 943 static inline void rxrpc_reduce_conn_timer(struct rxrpc_connection *conn,
 944                                            unsigned long expire_at)
 945 {
 946         timer_reduce(&conn->timer, expire_at);
 947 }
 948
 949 /*
 950  * conn_service.c
 951  */
 952 struct rxrpc_connection *rxrpc_find_service_conn_rcu(struct rxrpc_peer *,
 953                                                      struct sk_buff *);
 954 struct rxrpc_connection *rxrpc_prealloc_service_connection(struct rxrpc_net *, gfp_t);
 955 void rxrpc_new_incoming_connection(struct rxrpc_sock *,
 956                                    struct rxrpc_connection *, struct sk_buff *);
 957 void rxrpc_unpublish_service_conn(struct rxrpc_connection *);
 958
 959 /*
 960  * input.c
 961  */
 962 void rxrpc_data_ready(struct sock *);
 963
 964 /*
 965  * insecure.c
 966  */
 967 extern const struct rxrpc_security rxrpc_no_security;
 968
 969 /*
 970  * key.c
 971  */
 972 extern struct key_type key_type_rxrpc;
 973 extern struct key_type key_type_rxrpc_s;
 974
 975 int rxrpc_request_key(struct rxrpc_sock *, char __user *, int);
 976 int rxrpc_server_keyring(struct rxrpc_sock *, char __user *, int);
 977 int rxrpc_get_server_data_key(struct rxrpc_connection *, const void *, time64_t,
 978                               u32);
 979
 980 /*
 981  * local_event.c
 982  */
 983 extern void rxrpc_process_local_events(struct rxrpc_local *);
 984
 985 /*
 986  * local_object.c
 987  */
 988 struct rxrpc_local *rxrpc_lookup_local(struct net *, const struct sockaddr_rxrpc *);
 989 struct rxrpc_local *rxrpc_get_local(struct rxrpc_local *);
 990 struct rxrpc_local *rxrpc_get_local_maybe(struct rxrpc_local *);
 991 void rxrpc_put_local(struct rxrpc_local *);
 992 void rxrpc_queue_local(struct rxrpc_local *);
 993 void rxrpc_destroy_all_locals(struct rxrpc_net *);
 994
 995 /*
 996  * misc.c
 997  */
 998 extern unsigned int rxrpc_max_backlog __read_mostly;
 999 extern unsigned long rxrpc_requested_ack_delay;
1000 extern unsigned long rxrpc_soft_ack_delay;
1001 extern unsigned long rxrpc_idle_ack_delay;
1002 extern unsigned int rxrpc_rx_window_size;
1003 extern unsigned int rxrpc_rx_mtu;
1004 extern unsigned int rxrpc_rx_jumbo_max;
1005 extern unsigned long rxrpc_resend_timeout;
1006
1007 extern const s8 rxrpc_ack_priority[];
1008
1009 /*
1010  * net_ns.c
1011  */
1012 extern unsigned int rxrpc_net_id;
1013 extern struct pernet_operations rxrpc_net_ops;
1014
1015 static inline struct rxrpc_net *rxrpc_net(struct net *net)
1016 {
1017         return net_generic(net, rxrpc_net_id);
1018 }
1019
1020 /*
1021  * output.c
1022  */
1023 int rxrpc_send_ack_packet(struct rxrpc_call *, bool, rxrpc_serial_t *);
1024 int rxrpc_send_abort_packet(struct rxrpc_call *);
1025 int rxrpc_send_data_packet(struct rxrpc_call *, struct sk_buff *, bool);
1026 void rxrpc_reject_packets(struct rxrpc_local *);
1027 void rxrpc_send_keepalive(struct rxrpc_peer *);
1028
1029 /*
1030  * peer_event.c
1031  */
1032 void rxrpc_error_report(struct sock *);
1033 void rxrpc_peer_error_distributor(struct work_struct *);
1034 void rxrpc_peer_add_rtt(struct rxrpc_call *, enum rxrpc_rtt_rx_trace,
1035                         rxrpc_serial_t, rxrpc_serial_t, ktime_t, ktime_t);
1036 void rxrpc_peer_keepalive_worker(struct work_struct *);
1037
1038 /*
1039  * peer_object.c
1040  */
1041 struct rxrpc_peer *rxrpc_lookup_peer_rcu(struct rxrpc_local *,
1042                                          const struct sockaddr_rxrpc *);
1043 struct rxrpc_peer *rxrpc_lookup_peer(struct rxrpc_local *,
1044                                      struct sockaddr_rxrpc *, gfp_t);
1045 struct rxrpc_peer *rxrpc_alloc_peer(struct rxrpc_local *, gfp_t);
1046 struct rxrpc_peer *rxrpc_lookup_incoming_peer(struct rxrpc_local *,
1047                                               struct rxrpc_peer *);
1048 void rxrpc_destroy_all_peers(struct rxrpc_net *);
1049 struct rxrpc_peer *rxrpc_get_peer(struct rxrpc_peer *);
1050 struct rxrpc_peer *rxrpc_get_peer_maybe(struct rxrpc_peer *);
1051 void rxrpc_put_peer(struct rxrpc_peer *);
1052 void __rxrpc_queue_peer_error(struct rxrpc_peer *);
1053
1054 /*
1055  * proc.c
1056  */
1057 extern const struct seq_operations rxrpc_call_seq_ops;
1058 extern const struct seq_operations rxrpc_connection_seq_ops;
1059
1060 /*
1061  * recvmsg.c
1062  */
1063 void rxrpc_notify_socket(struct rxrpc_call *);
1064 int rxrpc_recvmsg(struct socket *, struct msghdr *, size_t, int);
1065
1066 /*
1067  * rxkad.c
1068  */
1069 #ifdef CONFIG_RXKAD
1070 extern const struct rxrpc_security rxkad;
1071 #endif
1072
1073 /*
1074  * security.c
1075  */
1076 int __init rxrpc_init_security(void);
1077 void rxrpc_exit_security(void);
1078 int rxrpc_init_client_conn_security(struct rxrpc_connection *);
1079 int rxrpc_init_server_conn_security(struct rxrpc_connection *);
1080
1081 /*
1082  * sendmsg.c
1083  */
1084 int rxrpc_do_sendmsg(struct rxrpc_sock *, struct msghdr *, size_t);
1085
1086 /*
1087  * skbuff.c
1088  */
1089 void rxrpc_kernel_data_consumed(struct rxrpc_call *, struct sk_buff *);
1090 void rxrpc_packet_destructor(struct sk_buff *);
1091 void rxrpc_new_skb(struct sk_buff *, enum rxrpc_skb_trace);
1092 void rxrpc_see_skb(struct sk_buff *, enum rxrpc_skb_trace);
1093 void rxrpc_get_skb(struct sk_buff *, enum rxrpc_skb_trace);
1094 void rxrpc_free_skb(struct sk_buff *, enum rxrpc_skb_trace);
1095 void rxrpc_lose_skb(struct sk_buff *, enum rxrpc_skb_trace);
1096 void rxrpc_purge_queue(struct sk_buff_head *);
1097
1098 /*
1099  * sysctl.c
1100  */
1101 #ifdef CONFIG_SYSCTL
1102 extern int __init rxrpc_sysctl_init(void);
1103 extern void rxrpc_sysctl_exit(void);
1104 #else
1105 static inline int __init rxrpc_sysctl_init(void) { return 0; }
1106 static inline void rxrpc_sysctl_exit(void) {}
1107 #endif
1108
1109 /*
1110  * utils.c
1111  */
1112 int rxrpc_extract_addr_from_skb(struct rxrpc_local *, struct sockaddr_rxrpc *,
1113                                 struct sk_buff *);
1114
1115 static inline bool before(u32 seq1, u32 seq2)
1116 {
1117         return (s32)(seq1 - seq2) < 0;
1118 }
1119 static inline bool before_eq(u32 seq1, u32 seq2)
1120 {
1121         return (s32)(seq1 - seq2) <= 0;
1122 }
1123 static inline bool after(u32 seq1, u32 seq2)
1124 {
1125         return (s32)(seq1 - seq2) > 0;
1126 }
1127 static inline bool after_eq(u32 seq1, u32 seq2)
1128 {
1129         return (s32)(seq1 - seq2) >= 0;
1130 }
1131
1132 /*
1133  * debug tracing
1134  */
1135 extern unsigned int rxrpc_debug;
1136
1137 #define dbgprintk(FMT,...) \
1138         printk("[%-6.6s] "FMT"\n", current->comm ,##__VA_ARGS__)
1139
1140 #define kenter(FMT,...) dbgprintk("==> %s("FMT")",__func__ ,##__VA_ARGS__)
1141 #define kleave(FMT,...) dbgprintk("<== %s()"FMT"",__func__ ,##__VA_ARGS__)
1142 #define kdebug(FMT,...) dbgprintk("    "FMT ,##__VA_ARGS__)
1143 #define kproto(FMT,...) dbgprintk("### "FMT ,##__VA_ARGS__)
1144 #define knet(FMT,...)   dbgprintk("@@@ "FMT ,##__VA_ARGS__)
1145
1146
1147 #if defined(__KDEBUG)
1148 #define _enter(FMT,...) kenter(FMT,##__VA_ARGS__)
1149 #define _leave(FMT,...) kleave(FMT,##__VA_ARGS__)
1150 #define _debug(FMT,...) kdebug(FMT,##__VA_ARGS__)
1151 #define _proto(FMT,...) kproto(FMT,##__VA_ARGS__)
1152 #define _net(FMT,...)   knet(FMT,##__VA_ARGS__)
1153
1154 #elif defined(CONFIG_AF_RXRPC_DEBUG)
1155 #define RXRPC_DEBUG_KENTER      0x01
1156 #define RXRPC_DEBUG_KLEAVE      0x02
1157 #define RXRPC_DEBUG_KDEBUG      0x04
1158 #define RXRPC_DEBUG_KPROTO      0x08
1159 #define RXRPC_DEBUG_KNET        0x10
1160
1161 #define _enter(FMT,...)                                 \
1162 do {                                                    \
1163         if (unlikely(rxrpc_debug & RXRPC_DEBUG_KENTER)) \
1164                 kenter(FMT,##__VA_ARGS__);              \
1165 } while (0)
1166
1167 #define _leave(FMT,...)                                 \
1168 do {                                                    \
1169         if (unlikely(rxrpc_debug & RXRPC_DEBUG_KLEAVE)) \
1170                 kleave(FMT,##__VA_ARGS__);              \
1171 } while (0)
1172
1173 #define _debug(FMT,...)                                 \
1174 do {                                                    \
1175         if (unlikely(rxrpc_debug & RXRPC_DEBUG_KDEBUG)) \
1176                 kdebug(FMT,##__VA_ARGS__);              \
1177 } while (0)
1178
1179 #define _proto(FMT,...)                                 \
1180 do {                                                    \
1181         if (unlikely(rxrpc_debug & RXRPC_DEBUG_KPROTO)) \
1182                 kproto(FMT,##__VA_ARGS__);              \
1183 } while (0)
1184
1185 #define _net(FMT,...)                                   \
1186 do {                                                    \
1187         if (unlikely(rxrpc_debug & RXRPC_DEBUG_KNET))   \
1188                 knet(FMT,##__VA_ARGS__);                \
1189 } while (0)
1190
1191 #else
1192 #define _enter(FMT,...) no_printk("==> %s("FMT")",__func__ ,##__VA_ARGS__)
1193 #define _leave(FMT,...) no_printk("<== %s()"FMT"",__func__ ,##__VA_ARGS__)
1194 #define _debug(FMT,...) no_printk("    "FMT ,##__VA_ARGS__)
1195 #define _proto(FMT,...) no_printk("### "FMT ,##__VA_ARGS__)
1196 #define _net(FMT,...)   no_printk("@@@ "FMT ,##__VA_ARGS__)
1197 #endif
1198
1199 /*
1200  * debug assertion checking
1201  */
1202 #if 1 // defined(__KDEBUGALL)
1203
1204 #define ASSERT(X)                                               \
1205 do {                                                            \
1206         if (unlikely(!(X))) {                                   \
1207                 pr_err("Assertion failed\n");                   \
1208                 BUG();                                          \
1209         }                                                       \
1210 } while (0)
1211
1212 #define ASSERTCMP(X, OP, Y)                                             \
1213 do {                                                                    \
1214         __typeof__(X) _x = (X);                                         \
1215         __typeof__(Y) _y = (__typeof__(X))(Y);                          \
1216         if (unlikely(!(_x OP _y))) {                                    \
1217                 pr_err("Assertion failed - %lu(0x%lx) %s %lu(0x%lx) is false\n", \
1218                        (unsigned long)_x, (unsigned long)_x, #OP,       \
1219                        (unsigned long)_y, (unsigned long)_y);           \
1220                 BUG();                                                  \
1221         }                                                               \
1222 } while (0)
1223
1224 #define ASSERTIF(C, X)                                          \
1225 do {                                                            \
1226         if (unlikely((C) && !(X))) {                            \
1227                 pr_err("Assertion failed\n");                   \
1228                 BUG();                                          \
1229         }                                                       \
1230 } while (0)
1231
1232 #define ASSERTIFCMP(C, X, OP, Y)                                        \
1233 do {                                                                    \
1234         __typeof__(X) _x = (X);                                         \
1235         __typeof__(Y) _y = (__typeof__(X))(Y);                          \
1236         if (unlikely((C) && !(_x OP _y))) {                             \
1237                 pr_err("Assertion failed - %lu(0x%lx) %s %lu(0x%lx) is false\n", \
1238                        (unsigned long)_x, (unsigned long)_x, #OP,       \
1239                        (unsigned long)_y, (unsigned long)_y);           \
1240                 BUG();                                                  \
1241         }                                                               \
1242 } while (0)
1243
1244 #else
1245
1246 #define ASSERT(X)                               \
1247 do {                                            \
1248 } while (0)
1249
1250 #define ASSERTCMP(X, OP, Y)                     \
1251 do {                                            \
1252 } while (0)
1253
1254 #define ASSERTIF(C, X)                          \
1255 do {                                            \
1256 } while (0)
1257
1258 #define ASSERTIFCMP(C, X, OP, Y)                \
1259 do {                                            \
1260 } while (0)
1261
1262 #endif /* __KDEBUGALL */